Sub-miniature tone decoder
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United States of America Patent
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-
Jan 18, 1983
Grant Date -
N/A
app pub date -
Sep 22, 1980
filing date -
Sep 22, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A tone decoder for the sixteen standard Bell System DTMF tone pairs is presented which is comprised of first and second tone detectors adapted to provide logic signals in response to detection of predetermined frequencies. The logic signals are processed by a counter which is incremented by simultaneous logic signals from the first and second tone detectors and which controls a switch adapted to change the frequencies to which the tone detectors are responsive.
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Cited Art Landscape
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